Wall thermostat problem

[Pete Masterson]

Does anyone know if the Hunter (or some other digital) can replace
the Dometic thermostats used for both AC and hydronic heat in my '95?
They appear to be analog/digital ... the temperature lever is a
rheostat (?) that slides back and forth (and isn't very precise) but
I see no moving parts inside the box -- just a circuit board. I was
hoping there was a control for the hysteresis (temperature lag) --
but there's none I can identify.

My issue with the thermostat is only with the heat -- it seems to
have a too narrow temperature range. For example, I like to keep the
bedroom cool for sleeping (around 60-62) if weather permits, but the
thermostat will cycle on for 15 seconds, then off for 15 seconds,
then on for 15 seconds, etc. I can get used to the fan noise (it's
not _that_ loud) but the constant on-off-on-off wakes me up and
drives me nuts. I wouldn't mind _more_ hysteresis so that heat would
run on for at least a few minutes before it cycles off for several
more minutes.

Anyone else have this issue? Any ideas?

Thanks.

Pete Masterson
'95 Blue Bird Wanderlodge WBDA 42
aeonix1@...
On the road at Golden CO



On Dec 9, 2007, at 10:03 AM, Don Bradner wrote:
<snip>
> The point of the digitals isn't for things like weekend differences
> - the digitals most use don't offer such "features." The points
> are: easy precision setting, low precise hysteresis, and no issues
> of contact sticking. The mercuries I replaced had high and variable
> hysteresis, in one case more than 10 degrees between off and on.
>
> The Hunter 42999B is cheap, easy to install, and easy to use. Wal-
> Mart is common source in the $20 range. The thermostat manual can
> be seen at http://www.hunterfanhq.com/tools/sales/h...preseason/
> images/owners/42999b.pdf or http://tinyurl.com/2g47pv